I can't think of the smuttiest, it was probably one on Manga Fox I was flipping through at the time mostly yuri ones :3 I like them to have somewhat of a story to them, and I'm pretty picky with drawing style when it comes to those.

Edit: Ok, yea, it was definitely works by Minami Haruka, and the other works in Yuri Hime Wildrose

so...one day...i was curious to what exactly smut was so...i dediced to read some chapter you know...and soo after i read chapter one everything is good..and second chapter...girl and boy are already you know doing this and that and i was like wdf? soo..there were 40 chapters in total and i was liek...dis is da best...you know 40 chapters of this and that and then got sick of it at chapter 5..cuz it was not all about this and that ...yo know DRAMA and other things came in and i stopped....after...